Making the Case For Microscopic Life In Meteorites

An anonymous reader writes "NASA scientist Dr. Richard Hoover claims he discovered evidence of extraterritorial life in a meteorite. He published his results in the March issue of Journal of Cosmology. In front of the article there is an official statement form the editor in chief: 'We believe Dr. Hoover's careful analysis provides definitive evidence of ancient microbial life on astral bodies some of which may predate the origin of Earth and this solar system. Dr. Richard Hoover is a highly respected scientist and astrobiologist with a prestigious record of accomplishment at NASA. Given the controversial nature of his discovery, we have invited 100 experts and have issued a general invitation to over 5000 scientists from the scientific community to review the paper and to offer their critical analysis.'"

Comments

Ah yes

[Anonymous Coward]

The Journal of Cosmology. They recently had an article called "Rouge Planet Discovered." About some Neptune-sized planet discovered in the oort cloud. They had this to say about the Bad Astronomy guy IN THE ARTICLE:

The torches and pitchforks crowd, led by astronomer-wannabe Phil Plait claims its not so. But then, Plait's most famous discovery was finding one of his old socks when it went missing after a spin in his dryer.

Sounds like a real reputable source.

As a biochemist, I've done extremely thorough research into the abiogenic origin of life. Earth, as it was, had all of the necessary building blocks for the formation of life. This "article" is pretty devoid of information, akin to a creationist saying "it was God because I believe it to be!"

Seriously slashdot editors, what the hell is wrong with you that you can't seem to do a basic source check?!

Re:Ah yes

[gilleain]

The Journal of Cosmology does have an amateur feel about it, but that doesn't necessarily mean that all articles in it are junk. My former supervisor published a paper there with a member of the Jet Propulsion Laboratory (Mike Russell) as co-author on the origin of life.

As a biochemist, I've done extremely thorough research into the abiogenic origin of life.

Really? I have a degree in biochemistry, yet I wouldn't say that necessarily gave me any special insight into abiogenesis. It's closer to geology than biology, I would think.

Since I liked it very much, I'll mention again on ./ the talk given by Nick Lane on the origin of life and the origin of multicellularity. Although his expertise is in mitochondrial energetics, he gave a nice summary of recent research (including Russell's work). Although most schemes are quite speculative, the one he outlined involved the common mineral serpentine acting as a kind of reaction chamber for primitive metabolism involving proton gradients and methanogenesis.

So, although conditions on the early Earth may have made chemical life inevitable, that doesn't mean this paper is nonsense, nor is this journal worthless just because of some slightly odd papers published in it.

Re:Ah yes

[gilleain]

You've got a degree in biochemistry and you think abiogenesis has more to do with geology?

I call bullshit.

My point was actually that "I a have a degree in X" is argument from authority - much as I dislike the formal argument ..er.. memes, tropes, whatever. I'll expand on my point a little:

Firstly, life is a complex system which continually repairs itself, and maintains a boundary separating itself from the environment. Alternatively, it is a series of positive feedbacks (explosions) controlled by negative feedback (death). Whatever definition is used, there is a clear principle that life comes from life - cells reproduce to make other cells; viruses hijack cellular machinery to make copies of themselves; etc. See Steven Rose on 'Lifelines' where he argues that the cell, not the gene is the fundamental unit of selection

So, clearly, some system nearly as complex as a living one was needed to 'initiate' life. The only possibility is a geological system. Now Graham Cairns-Smith (oddly enough, also at Glasgow) considered clays to be the template for ribozyme synthesis, with selection on those RNA molecules that stabilised or protected efficient clay replicators. He came up with the metaphor of a rope to illustrate the transition from system to system - clay to RNA to DNA to cell. In this metaphor, no 'strand' (system) stretches from one end of the rope to the other (which is an axis of time) but 'hands off' to the next system.

In Russell's theory, inorganic minerals form the boundary of proto-cells, and carry out primitive metabolism. Various iron/nickel sulphur minerals could have preformed the necessary redox reactions and proton gradients necessary for the energetic systems. Cooperation with short peptides in an autocatalytic cycle that generated longer protein-like catalysts was a possible method for bootstrapping enzymes. Personally, I don't see that there is a problem of which out of RNA and protein came first - perhaps both evolved at the same time and cross-catalysed each others autocatalysis.

In summary, the interface between life and non-life must necessarily involve a lot of geochemistry and geology. That's not to say that understanding of biochemistry is unneeded : many redox enzymes contain what are essentially nanocrystals of between 4 and 10 atoms that carry out essential parts of the reaction. Further, there is a PhD student in my lab who works on coenzymes (vitamins, essentially) who has done interesting work on the conservation of these coenzymes in evolution - perhaps there are some clues there as to the first mechanisms to arise to do things like C-C bond formation or peptide hydrolysis.

Re:"Journal of Cosmology"? never heard of it.

[starless]

From a quick google, it seems that Hoover already announced his "discovery" at least back in 2007, if not before:
http://www.panspermia.org/hoover2.htm
Richard B. Hoover of NASA/NSSTC announced today the discovery of evidence for the detection of a fossilized cyanobacterial mat in a freshly fractured, interior surface of the Orgueil carbonaceous meteorite. Many of the images presented were obtained 21-23 July 2004, using the Field Emission Scanning Electron Microscope at NASA's Marshall Space Flight Center in Huntsville, Alabama. The announcement was made in Denver, Colorado at the "Instruments, Methods, and Missions for Astrobiology VIII" (Conference 5555) at SPIE's International Symposium on Optical Science and Technology (its 49th Annual Meeting).

Re:be very, very skeptical

[The Bad Astronomer]

D'oh! I wasn't logged in, but this comment above is from me, Phil Plait. :)